Due to defects in printing equipment, printing plates, inks, human operations, etc., there will be deviations in the printing of the two-dimensional code. It is precisely because the QR code may produce poor quality during the printing process, so before use, we should check the QR code in advance, otherwise the QR code cannot be read, affecting the customer's trust in the product. In the actual production of two-dimensional code printing, the following issues need special attention.
Color contrast and registration
The two-dimensional code can be monochromatic black or multi-color overprint. The factors that affect the printing quality of two-dimensional codes mainly include color contrast and overprint errors.
1. Color contrast
Inadequate color contrast of newspaper QR codes will affect the recognition of QR codes by mobile phone software. Bar code printing symbol optical characteristics requirements: in order to read reliably, after printing, the line and space in the bar code should have a clear contrast, the empty reflectivity should be as large as possible, and the line reflectivity should be as small as possible. The domestic newsprint according to the national standard, the whiteness is more than 50%, normal printing can meet the recognition requirements of the two-dimensional code. However, it should be noted that when creating a QR code on a newspaper, the editor should be reminded that shading cannot be added to prevent situations where the contrast is insufficient to affect reading.
2. Overprint error
Mainly refers to the color QR code. When printing, the QR code must be neat and clear. Generally, we stipulate that the maximum value of overprint error (overprint error of main color and picture) should be less than or equal to 0.4 times the nominal width of the narrowest line barcode.
According to the national standard, the overprint error of newspapers is required to be less than or equal to 0.3mm. In fact, some newspapers at the provincial level and above with more advanced printing equipment and higher quality requirements can fully meet the standards in this regard. Some local newspapers, such as overprinting is not stable, it is recommended that the QR code be printed in monochrome, so that there is no overprinting problem.
Printing missing some elements
When printing, please pay attention to the loss of elements on the printing plate, so as not to cause difficulty in reading the QR code. In printing, due to the printing plate or blanket, it is easy to cause the printed pattern to be damaged. For the slightly "fragmented" pattern of the QR code, special attention should be paid to the pre-press plate making and post-check.
Printing ink color problem
To control the size error of the two-dimensional code symbol, the key is to control the ink color and printing pressure in printing to ensure the accurate restoration of the two-dimensional code stripes. Under normal conditions, we must ensure that "water is small and ink is small" when discharging ink, and at the same time ensure the necessary thickness of the ink layer. No streaks due to low pressure or insufficient ink color appear; no streaks due to excessive pressure or large ink appear.
The above are some common problems that appear in printed QR codes, and are actually the subject of our daily quality management. I hope that the above experience can provide a reference for the quality management of the two-dimensional code printing in the newspaper printing house.
LED Advertising Trucks
LEDadversting truck (also called outdoor advertising truck, mobile billboard truck, LED video truck, digital LED vehicle, LED advertising truck, LED digital display truck, mobile video truck, etc. ) is a new design for advertising. It is widely used in new products promotion, products live sale, mini show, concert, etc. LED truck could get the best effect with live video displaying.
Based on different situation, LED truck could be designed with single screen, double screen, triple screen.
As for the screen, there has several options: P6, P8, P10, P12. (P8 means 8mm pixels, smaller number, clearer picture.)
LED Advertising Trucks,LED Advertising Trailer Truck,Led Display Trucks,LED Mobile Advertising Trucks
CHENGLI SPECIAL AUTOMOBILE CO.,LTD , https://www.clwcntruck.com